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I purchased the spare tire as I replaced my RFT's. The tire compartment does not contain the black insert. Does anyone have a comment about inserting the insert ($150.00) as it might help with sound insulation.

Just a thought...I always keep an old bedspread in the trunk of my cars, just in case. On the X5, I spread it out around the spare tire to act as sound insulation while it's stored. Free and really easy installation (actually, no installation!).